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Millogo AA, Yaméogo L, Kassié D, de Charles Ouédraogo F, Guissou C, Diabaté A. Spatial modelling of malaria prevalence associated with geographical factors in Houet province of Burkina Faso, West Africa. GeoJournal 2023; 88:1769-1783. [PMID: 37159582 PMCID: PMC10161614 DOI: 10.1007/s10708-022-10692-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 05/23/2022] [Indexed: 05/11/2023]
Abstract
Malaria is a permanent threat to health in western Burkina Faso. Research has shown that geographical variables contribute to the spatial distribution in its transmission. The objective of this study is to assess the relationship between malaria prevalence and potential explanatory geographical variables in the Houet province in Burkina Faso. Statistics on malaria prevalence registered by health centres in the Houet province in 2017 and potential geographical variables identified through a literature review were collected. An Ordinary Least Squares (OLS) regression was used to identify key geographical variables and to measure their association with malaria while the Getis Ord Gi* index was used to locate malaria hotspots. The results showed that average annual temperature, vegetation density, percentage of clay in the soil, total annual rainfall and distance to the nearest waterbody are the main variables associated with malaria prevalence. These variables account for two-thirds of the spatial variability of malaria prevalence observed in Houet province. The intensity and direction of the relationship between malaria prevalence and geographical factors vary according to the variable. Hence, only vegetation density is positively correlated with malaria prevalence. Average temperature, for soil clay content, annual rainfall and for distance to the nearest water body are negatively correlated with the disease prevalence. These results show that even in an endemic area, malaria prevalence has significant spatial variation. The results could contribute to the choice of intervention sites, as this choice is crucial for reducing the malaria burden. Supplementary Information The online version contains supplementary material available at 10.1007/s10708-022-10692-7.
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Affiliation(s)
| | | | - Daouda Kassié
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), UMR ASTRE (Animal, Santé, Territoires, Risques, Ecosystèmes), Montpellier, France
| | | | - Charles Guissou
- Institut de Recherche en Sciences de La Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de La Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
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Fuchs S, Garrood WT, Beber A, Hammond A, Galizi R, Gribble M, Morselli G, Hui TYJ, Willis K, Kranjc N, Burt A, Crisanti A, Nolan T. Resistance to a CRISPR-based gene drive at an evolutionarily conserved site is revealed by mimicking genotype fixation. PLoS Genet 2021; 17:e1009740. [PMID: 34610011 PMCID: PMC8519452 DOI: 10.1371/journal.pgen.1009740] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 10/15/2021] [Accepted: 09/24/2021] [Indexed: 01/06/2023] Open
Abstract
CRISPR-based homing gene drives can be designed to disrupt essential genes whilst biasing their own inheritance, leading to suppression of mosquito populations in the laboratory. This class of gene drives relies on CRISPR-Cas9 cleavage of a target sequence and copying ('homing') therein of the gene drive element from the homologous chromosome. However, target site mutations that are resistant to cleavage yet maintain the function of the essential gene are expected to be strongly selected for. Targeting functionally constrained regions where mutations are not easily tolerated should lower the probability of resistance. Evolutionary conservation at the sequence level is often a reliable indicator of functional constraint, though the actual level of underlying constraint between one conserved sequence and another can vary widely. Here we generated a novel adult lethal gene drive (ALGD) in the malaria vector Anopheles gambiae, targeting an ultra-conserved target site in a haplosufficient essential gene (AGAP029113) required during mosquito development, which fulfils many of the criteria for the target of a population suppression gene drive. We then designed a selection regime to experimentally assess the likelihood of generation and subsequent selection of gene drive resistant mutations at its target site. We simulated, in a caged population, a scenario where the gene drive was approaching fixation, where selection for resistance is expected to be strongest. Continuous sampling of the target locus revealed that a single, restorative, in-frame nucleotide substitution was selected. Our findings show that ultra-conservation alone need not be predictive of a site that is refractory to target site resistance. Our strategy to evaluate resistance in vivo could help to validate candidate gene drive targets for their resilience to resistance and help to improve predictions of the invasion dynamics of gene drives in field populations.
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Affiliation(s)
- Silke Fuchs
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - William T. Garrood
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Anna Beber
- Department of Biology, University of Padua, Padua, Italy
| | - Andrew Hammond
- Department of Life Sciences, Imperial College London, London, United Kingdom
- Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, United States of America
| | - Roberto Galizi
- Centre for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, Staffordshire, United Kingdom
| | - Matthew Gribble
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Giulia Morselli
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Tin-Yu J. Hui
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Katie Willis
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Nace Kranjc
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Austin Burt
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Andrea Crisanti
- Department of Life Sciences, Imperial College London, London, United Kingdom
- Department of Molecular Medicine, University of Padua, Padua, Italy
- * E-mail: (AC); (TN)
| | - Tony Nolan
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, United Kingdom
- * E-mail: (AC); (TN)
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Chemonges Wanyama E, Dicko B, Pare Toe L, Coulibaly MB, Barry N, Bayala Traore K, Diabate A, Drabo M, Kayondo JK, Kekele S, Kodio S, Ky AD, Linga RR, Magala E, Meda WI, Mukwaya S, Namukwaya A, Robinson B, Samoura H, Sanogo K, Thizy D, Traoré F. Co-developing a common glossary with stakeholders for engagement on new genetic approaches for malaria control in a local African setting. Malar J 2021; 20:53. [PMID: 33478519 PMCID: PMC7818942 DOI: 10.1186/s12936-020-03577-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 12/31/2020] [Indexed: 11/19/2022] Open
Abstract
Stakeholder engagement is an essential pillar for the development of innovative public health interventions, including genetic approaches for malaria vector control. Scientific terminologies are mainly lacking in local languages, yet when research activities involve international partnership, the question of technical jargon and its translation is crucial for effective and meaningful communication with stakeholders. Target Malaria, a not-for-profit research consortium developing innovative genetic approaches to malaria vector control, carried out a linguistic exercise in Mali, Burkina Faso and Uganda to establish the appropriate translation of its key terminology to local languages of sites where the teams operate. While reviewing the literature, there was no commonly agreed approach to establish such glossary of technical terms in local languages of the field sites where Target Malaria operates. Because of its commitment to the value of co-development, Target Malaria decided to apply this principle for the linguistic work and to take the opportunity of this process to empower communities to take part in the dialogue on innovative vector control. The project worked with linguists from other institutions (whether public research ones or private language centre) who developed a first potential glossary in the local language after better understanding the project scientific approach. This initial glossary was then tested during focus groups with community members, which significantly improved the proposed translations by making them more appropriate to the local context and cultural understanding. The stepwise process revealed the complexity and importance of elaborating a common language with communities as well as the imbrication of language with cultural aspects. This exercise demonstrated the strength of a co-development approach with communities and language experts as a way to develop knowledge together and to tailor communication to the audience even in the language used.
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Affiliation(s)
| | - Bakara Dicko
- Malaria Research and Training Center, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Lea Pare Toe
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Mamadou B Coulibaly
- Malaria Research and Training Center, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Nourou Barry
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | | | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Mouhamed Drabo
- Department of Life Sciences, Imperial College London, London, UK
| | - Jonathan K Kayondo
- Department of Entomology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Souleymane Kekele
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Souleymane Kodio
- Malaria Research and Training Center, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Anselme Dinyiri Ky
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | | | - Emmanuel Magala
- Department of Entomology, Uganda Virus Research Institute, Entebbe, Uganda
| | | | - Solome Mukwaya
- Department of Entomology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Annet Namukwaya
- Department of Entomology, Uganda Virus Research Institute, Entebbe, Uganda
| | | | - Hatouma Samoura
- Malaria Research and Training Center, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Kadiatou Sanogo
- Malaria Research and Training Center, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
| | - Delphine Thizy
- Department of Life Sciences, Imperial College London, London, UK.
| | - Fatoumata Traoré
- Malaria Research and Training Center, University of Sciences, Techniques and Technologies of Bamako, Bamako, Mali
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